Towards compact high-frequency nonreciprocal devices using nanoplasma-switched time-varying metasurfaces

TL;DR

This paper presents an analytical framework for designing high-frequency nonreciprocal devices using nanoplasma switches in time-varying metasurfaces, demonstrating a 100 GHz microwave isolator.

Contribution

It introduces a time-Floquet analytical approach for nanoplasma-based nonreciprocal devices and provides a practical 100 GHz isolator example.

Findings

Analytical and full-wave simulation validation of a 100 GHz microwave isolator.

Potential realization in a parallel-plate waveguide.

Nanoplasma switches enable high-frequency time modulation.

Abstract

Time-modulated systems have received growing interest in recent years. They allow us to tailor effects, such as frequency conversion, single-direction propagation, etc. For the microwave band, semiconductor elements, such as varactors, are usually used as time-modulated elements but their modulation frequency has been limited to the few-gigahertz range. Recent advances in nanoplasma switches, i.e., two-state electronic switches based on a gas discharge in a nanometer-scale gap, provide a new potential for developing time-modulated systems with high operating frequencies. Here, we develop an analytical framework based on the time-Floquet method for the design of nonreciprocal time-modulated devices based on two-state time-modulated elements, for instance, nanoplasma-based switches. A practical example of a microwave isolator operating at 100~GHz frequency is developed and studied both analytically and using full-wave simulations. A potential realization in a parallel-plate waveguide is also simulated numerically.